This changeset adds support in DMA library to free source DMA buffer by
hardware. On a supported hardware, application can pass on the mempool
information as part of vchan config when the DMA transfer direction is
configured as RTE_DMA_DIR_MEM_TO_DEV.
Signed-off-by: Amit Prakash Shukla <amitpraka...@marvell.com>
Acked-by: Morten Brørup <m...@smartsharesystems.com>
Acked-by: Anoob Joseph <ano...@marvell.com>
---
lib/dmadev/rte_dmadev.h | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
diff --git a/lib/dmadev/rte_dmadev.h b/lib/dmadev/rte_dmadev.h
index b157ab7600..f7a6af2528 100644
--- a/lib/dmadev/rte_dmadev.h
+++ b/lib/dmadev/rte_dmadev.h
@@ -278,6 +278,13 @@ int16_t rte_dma_next_dev(int16_t start_dev_id);
#define RTE_DMA_CAPA_OPS_COPY_SG RTE_BIT64(33)
/** Support fill operation. */
#define RTE_DMA_CAPA_OPS_FILL RTE_BIT64(34)
+/** Support for source buffer free for mem to dev transfer.
+ *
+ * @note Even though the DMA driver has this capability, it may not support all
+ * mempool drivers. If the mempool is not supported by the DMA driver,
+ * rte_dma_vchan_setup() will fail.
+ **/
+#define RTE_DMA_CAPA_MEM_TO_DEV_SOURCE_BUFFER_FREE RTE_BIT64(35)
/**@}*/
/**
@@ -581,6 +588,19 @@ struct rte_dma_vchan_conf {
* @see struct rte_dma_port_param
*/
struct rte_dma_port_param dst_port;
+ /** Mempool from which source buffer is allocated. Mempool info is used
+ * for freeing source buffer by hardware when configured direction is
+ * RTE_DMA_DIR_MEM_TO_DEV. To free the source buffer by hardware,
+ * RTE_DMA_OP_FLAG_FREE_SBUF must be set while calling rte_dma_copy and
+ * rte_dma_copy_sg().
+ *
+ * @note If the mempool is not supported by the DMA device,
+ * rte_dma_vchan_setup() will fail.
+ *
+ * @see RTE_DMA_OP_FLAG_FREE_SBUF
+ */
+ struct rte_mempool *mem_to_dev_src_buf_pool;
+
};
/**
@@ -818,6 +838,13 @@ struct rte_dma_sge {
* capability bit for this, driver should not return error if this flag was
set.
*/
#define RTE_DMA_OP_FLAG_LLC RTE_BIT64(2)
+/** Mem to dev source buffer free flag.
+ * Used for freeing source DMA buffer by hardware when the transfer direction
is
+ * configured as RTE_DMA_DIR_MEM_TO_DEV.
+ *
+ * @see struct rte_dma_vchan_conf::mem_to_dev_src_buf_pool
+ */
+#define RTE_DMA_OP_FLAG_FREE_SBUF RTE_BIT64(3)
/**@}*/
/**
--
2.25.1
